The removal of oily, greasy residues and the eliminations of clogging scale deposits, helps to improve water flow and increase the filter efficiency. The dual action of the AquaPill Filter Cleaner & Degreaser will maintain peak filter performance and helps assure better water clarity and quality. Use at the start of the season, and, thereafter, monthly or whenever the pressure has risen to the higher end of the recommended operating range. If the pressure has risen by 10 p.s.i. or more, the product should be used twice the recommended dosage. This product is safe to use with all types of filters, in all types of pools and with all types of sanitizers. It will not affect the overall water chemistry. Use bi-weekly for trouble-free pools. Use one AquaPill for every 20,000 gallons of water.